|Publication number||US7646981 B2|
|Application number||US 10/791,365|
|Publication date||Jan 12, 2010|
|Filing date||Mar 1, 2004|
|Priority date||Mar 1, 2004|
|Also published as||CA2558228A1, CA2558228C, CN1951051A, EP1723740A1, US8000603, US20050191056, US20100111535, WO2005086401A1|
|Publication number||10791365, 791365, US 7646981 B2, US 7646981B2, US-B2-7646981, US7646981 B2, US7646981B2|
|Original Assignee||Adc Telecommunications, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (22), Non-Patent Citations (14), Referenced by (31), Classifications (11), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to wavelength division multiplexed optical networks.
Wavelength division multiplexed (WDM) optical networks are known where light of multiple wavelengths is spacially dispersed such that each wavelength of light is spacially separated from every other wavelength of light. A plurality of signals having wavelengths of different lengths can be combined for transmission over a single fiber optic cable. For optical transmission systems such as in a backbone network with a great demand for communication, a further increase in capacity has been found by reducing the optical frequency spacing of a plurality of signal channels to increase the degree of multiplexing. WDM processing with a higher degree of multiplexing is called dense wavelength division multiplexing (DWDM). Also, it is known in optical transmission systems where there is not a large demand for communication, the degree of multiplexing can be decreased by increasing the optical frequency spacing of a plurality of signal channels. This has the effect of reducing costs for the system components. WDM processing with a lower degree of multiplexing is called coarse wavelength division multiplexing (CWDM). In a CWDM system, inexpensive optical components can be used.
In WDM systems, and in particular CWDM systems, a variety of different media signals may be handled including coaxial, twisted pair (shielded and unshielded), and optical. WDM's including CWDM's are utilized to process these signals for transmission over fiber networks. In the case of multimode signals on fiber optic cables, WDM's can be used to process the signals for transmission on a multiplexed single cable system including a single mode fiber.
There is a need for conversion circuitry associated with the WDM's to convert the native protocol media signal (coaxial, twisted pair, multimode optical), into an appropriate signal for multichannel transmission on a single fiber optic cable. There is a further need to modularize such system components. In particular, there is a need to modularize the components of the system to address concerns that arise during initial setup, and modifications and upkeep of the system over time.
The present invention concerns a WDM optical system and method including first and second WDM's including an optical link therebetween. Preferably, the optical link includes both a transmit signal path and a receive signal path. Each WDM includes circuitry for linking a multiplexer and demultiplexer to a plurality of modular elements. The modular elements include a first set of modules for converting between native protocol media signals and common format signals, and a second set of modules for converting between the common format signals and optical signals at separate wavelengths for communication with the multiplexers and demultiplexers.
In one preferred embodiment, a WDM chassis includes a backplane including an input power port, a control signal port, and a plurality of optical interface ports for interfacing with an optical to electrical conversion module or card. Each optical interface port includes a power port, a control signal port, and at least one optical port. Each optical to electrical card includes a backplane interface portion for mating with the power port, the control signal port, and the at least one optical port of the optical interface port of the backplane. The optical to electrical cards include optical to electrical conversion circuitry for converting between common format signals and optical signals. Each optical to electrical card includes an electrical interface port including a power port, a control signal port, and at least one electrical port. The electrical interface port interfaces with an electrical to electrical conversion module or card. Each electrical to electrical card includes electrical to electrical conversion circuitry for converting between native protocol media signals and common format signals. Each electrical to electrical card includes a media interface port including at least one main signal port.
The WDM chassis includes optical signal splitters for splitting or combining of the multiplexed output and input optical signals. The splitters provide dual pathway protection between near and far ends of the optical system.
Referring now to
Referring now to
Referring now to
In the preferred embodiment, electrical to electrical conversion circuitry 100 is removably connectable to mux/demux circuitry 60. Further, in the preferred embodiment, optical to electrical conversion circuitry 90 is removably connectable to mux/demux circuitry 60. In addition, it is preferred that optical to electrical conversion circuitry 90 is removably connectable to electrical to electrical conversion circuitry 100. It is anticipated that a variety of different protocol media signals may be desired for handling by mux/demux circuitry 60. Appropriate conversion circuitry is selected for communicating between electrical to electrical conversion circuitry 100 and optical to electrical conversion circuitry 90, and also optical to electrical conversion circuitry 90 and mux/demux circuitry 60.
One result of the removable connections between components of WDM 52 is that a variety of native protocol media signals can be handled with a reduced number of components. In particular, the electrical to electrical conversion circuitry 100 can be selected for the native protocol media signals which are anticipated for WDM 52. The native protocol media signals can be converted into a common format signal such as NRZI digital format. An optical transceiver associated with optical to electrical conversion circuitry 90 uses the NRZI format signal to modulate a laser associated with each channel. Each laser associated with optical to electrical conversion circuitry 90 operates at a different wavelength. Receivers associated with the optical to electrical conversion circuitry 90 receive optical signals from mux/demux circuitry 60 and produce an NRZI format output signal which is transmitted to the electrical to electrical conversion circuitry 100.
By separating the optical to electrical conversion circuitry 90 from the electrical to electrical conversion circuitry 100, different grades of optical devices (i.e., data rates, launch power, and wavelength) can be employed as desired. Therefore, in low end applications like DS3, OC3, 10/100 M b/s Ethernet, lower cost components can be used.
Mux/demux circuitry 60 includes a power input port 62 which provides electrical power to a backplane 64. Backplane 64 can be constructed from a circuit board including appropriate circuit paths to link power from input power 62 to each O/E converter card 92. Backplane 64 includes optical couplers or interfaces 66, 68 (such as adapters) for each O/E converter card 92. Optical interfaces 66, 68 communicate through optical signal pathways 70, 72 to the multiplexer element 74 including multiplexer 76 or demultiplexer 78. From multiplexer 76 and demultiplexer 78, one by two splitters 84, 86 are provided at splitter circuitry 82 for creating the dual optical pathways. Optical pathways 77, 79 link multiplexer 76, and demultiplexer 78 to the respective splitters 84, 86. Preferably, optical pathways 36, 38, 56, 57, 58, 59 are single mode optical pathways.
Each O/E converter module or card 92 includes an optical link 96, 98 (such as connectors) for linking to optical interfaces 66, 68 of backplane 64. An electrical interface 80 provides for an electrical link from backplane 64 to each O/E converter card 92, such as for any necessary power needed by each O/E converter card 92. Also, electrical interface 80 can link control signals handled by backplane 64 and communicated to each O/E converter card 92.
Each E/E converter module or card 102 includes an electrical link 106, 108 for communicating electrical signals with each O/E converter card 92 which are then converted into optical signals for transmission through mux/demux circuitry 60. Each E/E converter card 102 includes pathways 120, 122 for communicating native protocol media signals on channels 22. An electrical link 104 connects between each E/E converter card 102 and the mated O/E converter cards 92 for conveying any power needed by E/E converter cards 102, and for any control signals to be communicated to the E/E converter cards 102.
Referring now to
Card edge connector 144 on O/E converter card 92 links to E/E converter card 102 by connecting to an edge contact 148 on E/E converter card 102. E/E converter card 102 includes one or more connectors 124 for connecting to native protocol media signals. E/E converter card 102 includes a circuit board 150 including circuitry 152 for converting signals from the native protocol media format into the common format, such as NRZI, between connectors 124 and edge contact 148. In the present system, it is anticipated that native protocol media signals include coaxial and twisted pair (shielded and unshielded). Also, it is anticipated that native protocol media signals include optical signals, such as multimode. Circuitry 152 of circuit board 150 also includes circuit pathways and elements for power conversion for use in signal conversion between connectors 124 and edge contact 148. Also, circuit pathways and elements are provided on circuit board 150 for receipt and processing of control signals received from backplane 64.
Referring now to
Both optical to electrical converter cards 92 slide into open front 282 of chassis construction 270. A rear end 94 of each optical to electrical converter card 92 includes edge contact 132 and fiber optic connectors 134, 136 for interfacing with perpendicularly arranged backplane 64. At a front end 95 of optical to electrical converter card 92, card edge connector 144 is positioned for interfacing with electrical to electrical converter card 102 arranged in a parallel manner. Adjacent to a back end 104 of E/E converter card 102 edge contact 148 is positioned for interfacing with card edge connector 144. At a front end 105 of E/E converter card 102 is positioned connectors 124. When both O/E converter card 92 and E/E converter card 102 are fully inserted into chassis construction 270, connectors 124 are presented along a front face 288 of chassis construction 270 and are linked with backplane 64 for signal transmission to other system components, including a far end WDM 54.
Chassis construction 270 further includes a CPU card 300 with ports 304, 306, 308 for connecting to other system components. CPU card 300 includes a rear interface (not shown on
Referring now to
E/E converter card 502 includes access circuitry 580 for test or patch access to the native protocol media signals. Such test access may include a splitter function where a portion of the signal is tapped off, such for monitoring. In the case of patch access, switches can be included, such as switching jacks, for completely removing connectors 572, 574 from the circuit paths. In this manner, signals to or from card 502 can alternatively be to a second location, instead of through backplane 464.
The electrical interface 80 preferably includes an identification feature which will identify a code on O/E converter card 92 so that only an appropriate wavelength output will be accepted for each interface 80. For example, a bit position could be hardwired on to the card edge connection circuitry. In this manner, only the desired O/E converter card 92 with the desired wavelength for the overall system can be inserted and used. CPU card 300 can be employed to run queries of each card 92. With such a system, cards 92 at the wrong wavelength cannot be inserted into backplane 64 and used to cause system communication failures.
Preferably, power input port 62 is Telco power, and any different power needed by either O/E converter cards 92 or E/E converter cards 102 can be accomplished through isolated power converters on each of the cards.
While WDM 52 is shown as including 16 channels of signals (16 wavelengths), greater or fewer channels can be handled by appropriately selected conversion circuitry and mux/demux circuitry. In one preferred implementation, an 18 channel system can be provided wherein at least one channel is reserved for interconnecting local and remote CPUs for management and control. WDM's 52, 54 are considered CWDM's in the preferred embodiment. There would be a 20 nm optical separation between each laser. Systems with 2, 4, 8, 16, 20, and 48+ channels can be implemented with appropriate O/E cards 92.
Path protection is accomplished by using a one by two splitter on the output of the WDM mux/demux circuitry 60. A one by two splitter will typically reduce the power level on each output fiber by 50%. Preferably, each laser associated with the O/E converter cards has a sufficiently high optical launch power that allows this system to use splitters for path protection instead of optical switches. This has particular application for short haul applications.
With the above systems, a variety of native protocol media signal formats can be supported using an appropriately selected E/E converter card 102. Optical inputs can also be supported wherein the E/E converter card 102 converts the optical signal into an electrical signal, such as in the common format signal, wherein that signal is then converted back into an appropriate optical signal in the O/E converter card 92 for communication with the mux/demux circuitry 60. By splitting the converting functions between O/E cards and E/E cards, the number of line cards needed to populate a given chassis is reduced.
The E/E converter cards 102 and the O/E converter cards 92 can be added over time as systems grow. A chassis construction 270 can be sold partially populated, and then as system needs increase, additional cards can be added. Also, upgrades can be easily added with only replacing one of the O/E converter cards 92 or the E/E converter cards 102, depending on the upgraded elements. In the case of field replaceability, only that component needing replacement needs to be removed and replaced. The modular O/E convert cards allow for lower cost optics to be used for less demanding applications (i.e., less than 155 Mb/s).
Systems 10, 12 are protocol independent. E/E converter cards 102 are selected for the given native protocol. O/E converter cards 92 are provided with the desired laser and optical performance. Such systems are advantageous during manufacture and during maintenance and upkeep over time.
While preferred systems include both transmit and receive pathways, other systems may only need transmit or receive on each respective near and far end WDM's 52, 54. For example, one way video does not need both transmit and receive functions at each end. In this system, the corresponding multiplexer or demultiplexer components and pathways can be removed to further save cost.
The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
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|U.S. Classification||398/79, 385/24, 398/67, 398/82, 398/68, 398/164|
|Cooperative Classification||H04J14/02, H04J14/0279, H04J14/0289|
|Jun 3, 2004||AS||Assignment|
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